I have a concrete floor in the art room and love it (although it can
be hard on the feet/legs sometimes). It cleans up well and every year
it gets a heavy duty cleaning over the summer and then resealed.
Originally it was supposed to be stained and then sealed, but they
forgot, didn't have the money or some other reason for not doing it!
Now I am thinking of having kids paint "rugs" of masterworks on the
floor this year before they reseal it again :-)
creatively, Linda in Oregon